you cant. its impossible
Lol no it's not, people do it all the time
no?? you literally cant change them... are you dumb..?
I think you can change the cover if you're the og uploader and you have access to the cover page
And about uploading new Manga, I've heard you have to email mangago to get permission. Even i wanna know how to do it buy unfortunately it didn't work for me, but you can always try.
How can you change a cover or upload a new manga?